Tandy 1000 Programmer's Reference Guide

Chawter 1 I Svstem Calls
ChMod
Change Attributes Function Call 43H
Gets the attributes of a file, or sets the attributes of a file to
those specified. (See the section “Disk Directory” in Chapter
4
for a description of file attributes.)
Entry Conditions:
AH = 43H
DS:DX
= pointer to ASCII2 pathname of file
AL = function number
01H = set file’s attributes to those in CX
OOH
= return file’s attributes in CX
CX
= attribute(s) to be set
Exit Conditions:
Carry set:
Carry not set:
Error Returns:
AX = 3
AX = 5
AX = error code
CX = current attribute(s) (if AL = OOH on entry)
Path not found. The path specified was invalid.
Access denied. The attributes specified in
CX included
one that could not be changed (directory, volume ID).
Invalid function. The function passed in AL was not
in the range 0-1.
AX = 1
Example:
ChMod equ 43H
Id5 dx,pathname
mov dx,attribute
mov a1,function
mov ah,43H
int
21 H
115

Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200